EVOLUTION OF MICROSTRUCTURE OF LASER SURFACE ALLOYING OF γ  TiAi ALLOY WITH NITROGEN

Abstract

Abstract: Laser surface alloying of γ TiAl alloy with nitrogen was studied under the constant protective nitrogen current (20l /min). The experimental results shown that the surface multi layers formed with experimental parameters could be up to 600μm depth; it consists of TiN,Ti 2AlN,α 2 and γ phases, without AlN, and the irregular coarse continuous “flow” line,dendrite,needle and granular nitrides disperse on the fine dendrite casting α 2 and γ phases substrate. The microstructure and compositions in the nitiding layer were determined and analyzed by SEM and EPMA and the mechanism for the formation of microstructure in the nitriding layer was also discussed.

Key words: laser surface alloying, gas nitiding, microstructure

D.Wen 1) , Q.K.Cai 2) ,C.S. Liu 1) , Y.J. Guo 1) and Y.H.Zhao 1) 1) School of Materials and Metallurgy, Northeastern University, Shenyang 110006,China 2) Shenyang University, Shenyang 110044, China. EVOLUTION OF MICROSTRUCTURE OF LASER SURFACE ALLOYING OF γ TiAi ALLOY WITH NITROGEN[J]. Acta Metallurgica Sinica (English Letters), 1999, 12(5): 860-866.

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EVOLUTION OF MICROSTRUCTURE OF LASER SURFACE ALLOYING OF γ TiAi ALLOY WITH NITROGEN

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